Upcoming PyCXX releases

[Barry S. <ba...@ba...>]

My plan is to keep maintaining PyCXX 6.2 with fixes for the time being.

In parallel I will release a Beta for PyCXX 7.0 for testing and feedback.

I have bumped the version to 7.0 because of the extensive changes to way
exceptions are handled in PyCXX. 7.0.0 should be compatible with earlier
code, however this needs testing.

The major feature of 7.0 is that you can raise and catch all standard
python exceptions and any C++ user defined exceptions in an obvious way:

try
{
    Py::Callable callback = …;

    callback.apply( args );
}
catch( Py::LookupError &e )
{
    e.clear();
    std::cerr << “Lookup error” << std::endl;	
}

Before you would have had to catch Py::Exception and then match
to lookup error.

You can have any nesting of C++ and python code calling each other
and the exception will rise up the stack until caught by C++ or
python code.

Demo/Python3/simple.cpp and test_simple.py show how to use the new features.

7.0.0 has been tested on Windows, macOS and Fedora.
32 and 64 bit python has been tested as well
as python versions 2.6, 2.7, 3.3, 3.4 and 3.5.

Barry